Put Options Explained

A put option gives the holder the right to sell 100 shares per standard equity contract at the strike price until expiration. You pay premium upfront. If the stock falls, the put usually gains value because selling at the strike looks better than selling at the market.

Puts are not only for bearish bets. Investors often buy puts on stock they already own as insurance. That idea is the protective put.

Payoff at expiration

At expiry, put value per share is:

max(strike − stock price, 0)

Profit or loss subtracts premium:

max(strike − stock price, 0) − premium paid

Breakeven and outcomes for long puts

• Max loss: Premium paid if the stock finishes above the strike at expiration.
• Breakeven at expiration: Strike − premium per share.
• Max gain per share (theoretical): Strike − premium if the stock went to zero (rare, but defines the shape).

Puts gain when the stock falls, so delta is negative. ATM puts often show delta near −0.50. See Delta explained.

Worked example 1: bearish long put

ABC trades at $100. You buy the $100 put for $4.00 ($400 per contract).

• Breakeven at expiry: $96 ($100 − $4).
• If ABC finishes at $90, intrinsic value is $10 ($1,000). P/L ≈ $600 after $400 premium.
• If ABC finishes at $105, the put expires worthless. You lose $400.

With 30 days left, if ABC drifts sideways at $100, the put can still lose value from theta. Time hurts long option buyers unless the stock moves your way fast enough. Read Theta explained.

Worked example 2: protective put on stock you own

You own 100 shares of ABC at $100 (cost $10,000). You buy one $95 put for $2.00 ($200).

• Below $95 at expiration, the put's intrinsic value roughly offsets stock losses down to the strike zone (minus the $200 premium).
• At $100 expiry, stock is flat but the put expires worthless. You lost $200 on the put, like an insurance premium.
• At $80 expiry, stock lost $2,000. Put intrinsic is $15 ($1,500). Net stock+put loss about $700 including premium, versus $2,000 without the hedge.

Combined position delta is less than +1 because the put adds negative delta. You gave up some upside drag from premium in exchange for a floor near the strike.

Buying puts vs selling puts

Long put (buyer):

• Pays premium.
• Profits from a meaningful drop before costs.
• Risk limited to premium.
• Usually negative theta, positive vega (see Vega explained).

Short put (seller):

• Collects premium.
• Profits if the stock stays high enough.
• May be assigned and forced to buy stock at the strike.
• Risk can be large in a crash. See Short put and Cash-secured put.

Moneyness and premium

Label	Put vs stock at $100	At-expiry intrinsic
ITM	Strike $105	$5 if stock at $100
ATM	Strike $100	$0 if stock at $100
OTM	Strike $95	$0 if stock at $100

OTM puts are cheaper but need a larger drop. ITM puts cost more and behave more like a short stock position plus a residual option piece. Details in Strike price and moneyness.

Implied volatility and puts

When IV rises, puts often get more expensive along with calls. A calm market can cheapen puts even if you feel nervous about the stock. Implied volatility basics covers crush after events.

Long puts are often long vega. If IV drops after you buy, the put can lose value without a stock move.

Tie-in to payoff charts

A long put payoff chart slopes down as stock rises (loss capped at premium) and slopes up as stock falls (gain increases until intrinsic dominates). Compare with calls in How to read an options payoff chart.

Use Greeks in the builder on a long put template. Slide valuation date toward expiration and watch negative delta deepen on ITM puts.

Choosing expiration

Shorter dated: Lower premium, faster theta, less time for a slow decline.

Longer dated: Higher premium, more time, slower daily decay early on.

Expiration and time decay connects calendar choice to theta.

Puts vs shorting stock

Shorting stock has borrow costs, unlimited theoretical risk on a rally, and different margin rules. A long put offers defined risk equal to premium and does not require locating shares to borrow. The tradeoff is theta and IV: the put expires, while a short stock position has no expiration clock (but has carry and buy-in risk).

Using puts in spreads

Bear put spreads and collars combine puts with other legs to cap cost or hedge stock. Once you understand single-leg put payoff, read Bear put spread and Collar for defined-risk structures with flatter payoff charts.

Contract multiplier reminder

A $4.00 put costs $400 per contract plus fees. Profit zones in this guide are per share; multiply by 100 for contract cash flows unless your broker display already scales for you.

Common mistakes

• Expecting profit on a small dip when breakeven is still lower.
• Buying puts right before IV collapses (post-earnings premium shrink).
• Selling puts without a plan for assignment and capital to buy stock.

Next steps

Open the long put builder. Read Long put for a full strategy walkthrough. Contrast with Call options explained for the buy-side mirror.

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ThetaViz provides educational tools only. This guide is not investment, tax, or legal advice. Prices, margin requirements, and tax rules change. Confirm details with your broker and qualified professionals before trading.